Multiple choice

Why is blood circulation in human body called double circulation?

  1. Because it has both oxygenated and deoxygenated blood in it.

  2. Because blood flows through two different vessels, i.e. arteries and veins.

  3. Because blood flows twice in the heart before it completes one circulation.

  4. Because blood flows through heart and lungs in one circulation.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is called double circulation because blood flows twice in the heart before it completes one full circulation.

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